so·re·di·um (s -r  d-m)n. pl. so·re·di·a (-d -) A specialized asexual reproductive unit of lichens consisting of a mass of algal cells surrounded by fungal hyphae. [New Latin s  rdium, diminutive of Greek sros, heap; see sorus.]so·re di·al (-d-l) adj. |
soredium [sɔːˈriːdɪəm]
n
(Life Sciences & Allied Applications / Botany) an organ of vegetative reproduction in lichens consisting of a cluster of algal cells enclosed in fungal hyphae: dispersed by wind, insects, or other means
[New Latin, from Greek sōros a heap]
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